US3651612A - Floor joist - Google Patents

Floor joist Download PDF

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US3651612A
US3651612A US3651612DA US3651612A US 3651612 A US3651612 A US 3651612A US 3651612D A US3651612D A US 3651612DA US 3651612 A US3651612 A US 3651612A
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Prior art keywords
chord
strips
members
end
wood
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Jack N Schmitt
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TRUSWAL SYSTEMS Corp A CORP OF
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TRUSWAL SYSTEMS Inc
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00Structural elongated elements designed for load-supporting
    • E04C3/02Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/12Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
    • E04C3/16Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with apertured web, e.g. trusses

Abstract

A truss-type floor joist formed of vertically aligned parallel chords connected together between their ends by alternating diagonal web members and at their ends by a pair of vertical end members arranged in face-to-face contact, with the chords, web members and end members all formed of 2 X 4 wood strips arranged with their narrow edges vertical. Each chord has an inner liner member in the form of a 2 X 4 wood strip member arranged in faceto-face contact therewith and extending from each end of the chord to a point just past its first, adjacent set of diagonal web members. Each of the joints formed by abutting web members and end members with the chords are overlapped on both vertical faces with metal connector plates having struck-out teeth embedded in the respective overlapped wood members.

Description

United States Patent Schmitt [451 Mar. 28, 1972 [s41 FLOOR JOIST Primary Examiner-Henry C. Sutherland [72] Inventor. Jack N. Schmitt, Birmingham, Mich. Anamey cunen, Settle, Sloman & Cantor [73] Assignee: Truswal Systems, Inc., Troy, Mich.

57 ABSTRACT [22] Filed: Nov. 18, 1970 1 A truss-type floor joist formed of vertically aligned parallel [2n Appl' 90,579 chords connected together between their ends by alternating diagonal web members and at their ends by a pair of vertical 521 0.5. CI. ..52/693, 52/642, 52/730 end members arranged in face-04m 60mm with 511 Int. Cl ..E04c 3/12 chmds, web members and end members 2x4 58 Field of Search ..52/639 642 690 693 696 StripS arranged with their edges Each 5 chord has an inner liner member in the form of a 2X4 wood strip member arranged in face-to-face contact therewith and extending from each end of the chord to a point just past its [56] References Cited first, adjacent set of diagonal web members. Each of the joints UNITED STATES PATENTS formed by abutting web members and end members with the chords are overlapped on both vertical faces with metal con- 2,385,l42 9/1945 Lank ..52/639 nector plates having struckout teeth embedded in the respec 2,886,857 5/1959 Brosenius .....52/639 fi overlapped wood membem 3,170,198 2/1965 Snider ..52/642 3,53 1,904 10/1970 Sanford ..52/642 2 Claims, 4 Drawing Figures S a f 1 a 4 /3 /4a a Patented March 28, 1972 FIG. I

mvemoa JACK N. SCHMITT ATTORNEYS FLOOR JOIST BACKGROUND OF INVENTION 1 Floor joists used to support the floor in a small building, and similarly used to support flat roof sections, have been typically made of large wood beams, such as 4X8 and 2X6 in cross section, or alternatively, out of metal I-beams. Suitable lumber for this purpose is relatively expensive and difficult to obtain and process. Likewise, metal I-beams are also relatively expensive and difficult to handle and assemble into the building construction.

Thus, the invention herein relates to floor joists formed in a truss-like shape out of conventional, readily available and inexpensive 2 4 wood strips which joists may then be used in small building construction such as in dwelling houses, for floor joists as well as ceiling joists where appropriate.

SUMMARY OF INVENTION The invention herein contemplates forming floor joists in a truss-like configuration out of long, parallel chords made of conventional 2X4 lumber with the chords interconnected by alternating diagonally arranged 2X4 web members and vertically arranged end members with all joints connected together by means of conventional flat, sheet metal connector plates which include integral struck-out teeth for embedding into the wood. Such type connector plates are illustrated for example in the patent to Broder, US. Pat. No. 3,242,788 granted Mar. 29, 1966.

More specifically, the invention herein contemplates forming the opposite ends of the chords in double thickness by means of inner, short length 2X4 liners arranged in face-toface contact with the opposite inner surfaces of the chords, and also forming the vertical end supports in double thickness 2X4 members and doubling the thickness of one of the two diagonal web members, whichever is the first tension loaded member, which are arranged between the doubled end portions of the chords. The 2X4s on all the members are arranged horizontally, that is, their thin or narrow edges are in the vertical plane and their wide edges are in the horizontal plane. Further, the doubled thickness members, being unconnected to each other except along the vertical plane by means of the vertical arranged connector plates, have some limited movement relative to each other to absorb stresses and strains and to avoid any tendency to crack or split lengthwise, thus forming a joist which may be of considerable length, yet of a high degree of stiffness and strength with minimal tendency to crack under varying loads.

Hence, an essential object of this invention is to form a truss-type joist of considerable strength and rigidity yet of low cost using readily available and low cost 2X4 lumber.

Other objects and advantages of this invention will become apparent upon reading the following description, of which the attached drawings form a part.

DESCRIPTION OF DRAWINGS FIG. 1 is an elevational view of one end of the joist. FIG. 2 is an enlarged, perspective view of the opposite end of the joist, and

FIG. 3 is an enlarged, fragmentary view of a section taken in the direction of arrows 33 of FIG. 2.

FIG. 4 is an elevational view of the end portion of a modified joist.

DETAILED DESCRIPTION FIG. 1 illustrates a floor joist which is of considerable length relative to its height. For example, typical sizes would run approximately 24 feet long by 16 inches high or 28 feet long by 20 inches high or 32 feet long by 24 inches high. Obviously, the length may be varied considerably whereas the height is relatively low compared to the length and varies only slightly despite increases of length.

The joist is formed of an upper chord l l, a lower chord 12, with the chords interconnected by sets of alternating diagonally arranged web members 13 and 14 and by opposite end vertical end members 15.

As illustrated in FIGS. 1 and 2, the upper chord 11 is formed of anouter, long 2X4 wood strip 17 having an inner, short 2X4 wood strip 18 arranged in face-to-face contact at its opposite ends. Likewise, the lower chord 12 is formed of a long 2X4, outer wood strip 19 having its opposite inner ends lined with a short 2X4 wood strip liner 20.

Each of the vertical end members 15 are formed of a pair of 2X4 wood strips 21, arranged face-to-face. Also, the diagonal web member 14a which is second from each of the opposite ends, and which is normally under tension, is formed of a pair of 2X4 wood strips 22 and 22a arranged face-to-face. In the event the joist is to be so loaded that the first web members 13a (the ones nearest to the joist ends) are to be in tension, then that first web member is formed of a pair of 2X4 wood strips, instead of the second web members 14a.

As is illustrated in FIG. 2, all of the 2X4s are arranged on their sides, that is, with their broad or wide faces in the horizontal plane and their narrow edges in the vertical plane.

The reference herein to 2X4 wood strips refers to conventional lumber, commonly called 2X4 meaning 2 inches by 4 inches in cross section, but actually of a slightly smaller size when the lumber is dressed. The size of the wood strips is not critical and may be varied somewhat but the size herein referred to indicates the use of the conventionally available inexpensive wood strips as contrasted with the previously used large size wood beams which are relatively expensive, tend to crack and are not readily available.

The opposite ends of the web members abut the interior surfaces of the chords as does the opposite ends of the end members 15 to form joints which are connected by means of conventional, fiat sheet metal connector plates of the type illustrated, for example, in the above-mentioned Broder US. Pat. No. 3,242,788-of March 29, 1966. These plates consist of flat sheet metal having struck-out teeth of suitable configuration for embedding into the wood.

FIG. 3 illustrates a corner joint wherein the plates 25, arranged on each vertical face of the joint have their teeth 26 embedded into the chord strips 17 and 18 and into the vertical end members 21. The plates are typically secured into position by first arranging all the wood parts in their proper relationship, then placing the plates above and below the joints and squeezing them into the wood by meansof a suitable press.

The size of the plates may vary, depending upon the size of the joints and thus, large plates 24 may be used on most of the joints with smaller plates 25 at the joints of less area.

As described above, the double thickness portions of the chords, web member 14a and end members 15 are so formed that the two strips making up the double thickness are relatively movable to the extent that they are not fastened face-toface but are fastened together only on their vertical edges by means of the plates with the embedded teeth so that there is some degree of relative movement or relative buckling permitted between the double thickness members which functions to better absorb stresses and to yield thereunder and to avoid cracking or splitting which frequently occurs in heavier, prior types of wood beams. Thus, the double thickness members are for all practical purposes not secured together except at their ends and then only along their side or vertical edge faces so as to permit this relative movement or buckling.

However, for some constructions, it is desirable to anchor the double thickness portions of the chord further for suitable strength requirements. Thus, FIG. 4 illustrates a modification wherein the upper chord is provided with an additional connector plate 28 at the free end of its inner or liner wood strip 18 and the lower chord is provided with a similar connector plate 29 midway between its ends. The inner and outer members of each chord are still free to move slightly relative to each other particularly since they are secured together only along their vertical faces by the embedded connector plate teeth.

vention, I now claim:

1. A floor joist comprising:

a pair of long, vertically spaced apart, parallel chords, each formed of a long outer 2X4 wood strip and a pair of short inner 2X4 strips extending from the outer ends from the long outer wood strip a short distance towards the center thereof, the inner strips being in loose face-toface contact with the respective outer strips to form double thickness short end portions on each chord, and with the 2 4 strips all laid on their sides so that their opposite narrow edges are vertical and coplanar;

a vertical end member spanning the space between and endwise abutting the inner chord strips at each opposite end thereof; each end member being formed of a pair of 2X4 wood strips arranged loosely together face-to-face with their narrow edges in the same planes as the corresponding chord strip narrow edges;

sets of alternating diagonally arranged web members extending along the length of the chord, with each web member diagonally spanning the space between the chords and endwise abutting the opposed inner surfaces of the chords, and with each formed of a 2X4 wood strip having its opposite narrow edges coplanar with the chord strip narrow edges;

a vertically arranged, flat sheet metal connector plate overlapping each of the vertical faces of each joint formed between the web members and the chord and the end members and the chord and secured to same by integral struck-out teeth embedded therein for securing the members and chord together;

with the plates overlapping the end member joints also overlapping and securing the outer and inner chord strips together and the plates overlapping the first set of web members closest to the end members also overlapping and securing the outer and inner chord strips together;

and the inner chord strips terminating only a short distance from said first set of web members;

the pairs of strips forming the double thickness chord end portions and the end members having their contacting faces free of securement to each other and being slightly relatively movable for absorbing stresses and avoiding longitudinal splitting.

2. A floor joist as defined in claim 1 and wherein the first tension loaded web member from each opposite end of the joist, that is, one of the two of the nearest set of web members to each opposite end which is to be loaded in tension, is formed of double thickness 2X4 wood strips, with the remaining web members being of single wood strips.

Claims (2)

1. A floor joist comprising: a pair of long, vertically spaced apart, parallel chords, each formed of a long outer 2 X 4 wood strip and a pair of short inner 2 X 4 strips extending from the outer ends from the long outer wood strip a short distance towards the center thereof, the inner strips being in loose face-to-face contact with the respective outer strips to form double thickness short end portions on each chord, and with the 2 X 4 strips all laid on their sides so that their opposite narrow edges are vertical and coplanar; a vertical end member spanning the space between and endwise abutting the inner chord strips at each opposite end thereof; each end member being formed of a pair of 2 X 4 wood strips arranged loosely together face-to-face with their narrow edges in the same planes as the corresponding chord strip narrow edges; sets of alternating diagonally arranged web members extending along the length of the chord, with each web member diagonally spanning the space between the chords and endwise abutting the opposed inner surfaces of the chords, and with each formed of a 2 X 4 wood strip having its opposite narrow edges coplanar with the chord strip narrow edges; a vertically arranged, flat sheet metal connector plate overlapping each of the vertical faces of each joint formed between the web members and the chord and the end members and the chord and secured to same by integral struck-out teeth embedded therein for securing the members and chord together; with the plates overlapping the end member joints also overlapping and securing the outer and inner chord strips together and the plates overlapping the first set of web members closest to the end members also overlapping and securing the outer and inner chord strips together; and the inner chord strips terminating only a short distance from said first set of web members; the pairs of strips forming the double thickness chord end portions and the end members having their contacting faces free of securement to each other and being slightly relatively movable for absorbing stresses and avoiding longitudinal splitting.
2. A floor joist as defined in claim 1 and wherein the first tension loaded web member from each opposite end of the joist, that is, one of the two of the nearest set of web members to each opposite end which is to be loaDed in tension, is formed of double thickness 2 X 4 wood strips, with the remaining web members being of single wood strips.
US3651612A 1970-11-18 1970-11-18 Floor joist Expired - Lifetime US3651612A (en)

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Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867803A (en) * 1973-09-27 1975-02-25 Richardson Lumber Company Flat joist truss with rounded load-transfer surfaces
US3961455A (en) * 1973-05-29 1976-06-08 Peters Dierk D Truss support connector
US4160350A (en) * 1978-07-03 1979-07-10 Craib Rupert G Floor joist plate
US4207719A (en) * 1978-04-03 1980-06-17 James Knowles Composite construction beam
US4228631A (en) * 1978-09-12 1980-10-21 Geffe Bruce T Hollow rectangular joist
US4457118A (en) * 1981-08-14 1984-07-03 Bowen Alfred J Integral foundation and floor frame system and method of building construction
FR2554482A1 (en) * 1983-11-04 1985-05-10 Blanvillain Fils Ets Lightened beam for a framework and framework comprising such beams
US4641480A (en) * 1985-06-03 1987-02-10 Inter-Lock Steel Company, Inc. Combination connector plate and tail truss
US4659604A (en) * 1986-02-20 1987-04-21 Boise Cascade Corporation Adhesive/nail plate truss assembly
US4891927A (en) * 1983-10-07 1990-01-09 Metsaliiton Teollisuus Oy Joint for connecting wooden beams to each other, and the use of the joint in roof truss structures
US5560177A (en) * 1996-03-04 1996-10-01 Brightwell; Lionel L. Trimmable open web joist
US5592800A (en) * 1995-01-20 1997-01-14 Truswal Systems Corporation Truss with adjustable ends and metal web connectors
US5761872A (en) * 1993-04-21 1998-06-09 Sanford; Emmett Barry Variable length truss and method for producing the same
US5867963A (en) * 1997-09-23 1999-02-09 Truswal Systems Corporation Trimmable truss apparatus
US6256958B1 (en) 1997-06-30 2001-07-10 Perf-X-Dek, L.L.C. Floor joist system
US20010039779A1 (en) * 2000-05-10 2001-11-15 Romaro 2000 Limitee Structural wooden joist
US20020148192A1 (en) * 2001-02-13 2002-10-17 Romaro 2000 Limitee Structural wooden joist
US6568134B2 (en) * 2001-07-20 2003-05-27 Thomas E. Kerney Componentized, three dimensional, self-aligning, self-engineering building system for homes, and modeling blocks therefor
US6651306B1 (en) 1999-07-23 2003-11-25 Mitek Holdings, Inc. Apparatus and method for fabricating flat trusses
US20050086893A1 (en) * 2003-10-24 2005-04-28 Moody Donald R. Metal truss
US20060123733A1 (en) * 2004-12-09 2006-06-15 Moody Donald R Roof truss
US7093628B2 (en) 2000-10-06 2006-08-22 Mitek Holdings, Inc. Method of and apparatus for forming timbers with rounded ends
US20080134619A1 (en) * 2006-12-06 2008-06-12 Georgia-Pacific Wood Products Llc I-beam joist having openings formed therein for mechanical access
US20100263319A1 (en) * 2009-04-16 2010-10-21 Andre Lemyre Top-chord bearing wooden joist and method
CN101949212A (en) * 2010-09-29 2011-01-19 中冶建筑研究总院有限公司;中国京冶工程技术有限公司 Slabform detachable support system and construction method thereof
US20120076977A1 (en) * 2010-09-27 2012-03-29 Weyerhaeuser Nr Company Reinforced wood product and reinforcement component
US20120324827A1 (en) * 2011-06-25 2012-12-27 James Forero Bracing system for reinforcing beams
US20170016229A1 (en) * 2015-07-16 2017-01-19 Les Chantiers De Chibougamau Ltée I-joists and method of fabrication thereof
US9663938B2 (en) * 2015-08-21 2017-05-30 Columbia Insurance Company Hanger for bracing panel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2385142A (en) * 1943-12-14 1945-09-18 Timber Engineering Co Timber truss and the like
US2886857A (en) * 1953-12-14 1959-05-19 Hyresgaesternas Sparkasse Och Wooden beam constructions
US3170198A (en) * 1960-06-22 1965-02-23 Eliot I Snider Wooden i-beam
US3531904A (en) * 1968-06-17 1970-10-06 Sanford Arthur C Reinforced construction for wood stress members

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2385142A (en) * 1943-12-14 1945-09-18 Timber Engineering Co Timber truss and the like
US2886857A (en) * 1953-12-14 1959-05-19 Hyresgaesternas Sparkasse Och Wooden beam constructions
US3170198A (en) * 1960-06-22 1965-02-23 Eliot I Snider Wooden i-beam
US3531904A (en) * 1968-06-17 1970-10-06 Sanford Arthur C Reinforced construction for wood stress members

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961455A (en) * 1973-05-29 1976-06-08 Peters Dierk D Truss support connector
US3867803A (en) * 1973-09-27 1975-02-25 Richardson Lumber Company Flat joist truss with rounded load-transfer surfaces
US4207719A (en) * 1978-04-03 1980-06-17 James Knowles Composite construction beam
US4160350A (en) * 1978-07-03 1979-07-10 Craib Rupert G Floor joist plate
US4228631A (en) * 1978-09-12 1980-10-21 Geffe Bruce T Hollow rectangular joist
US4457118A (en) * 1981-08-14 1984-07-03 Bowen Alfred J Integral foundation and floor frame system and method of building construction
US4891927A (en) * 1983-10-07 1990-01-09 Metsaliiton Teollisuus Oy Joint for connecting wooden beams to each other, and the use of the joint in roof truss structures
FR2554482A1 (en) * 1983-11-04 1985-05-10 Blanvillain Fils Ets Lightened beam for a framework and framework comprising such beams
US4641480A (en) * 1985-06-03 1987-02-10 Inter-Lock Steel Company, Inc. Combination connector plate and tail truss
US4659604A (en) * 1986-02-20 1987-04-21 Boise Cascade Corporation Adhesive/nail plate truss assembly
US5761872A (en) * 1993-04-21 1998-06-09 Sanford; Emmett Barry Variable length truss and method for producing the same
US6139667A (en) * 1993-04-21 2000-10-31 Sanford; Emmett Barry Variable length truss and method for producing the same
US5592800A (en) * 1995-01-20 1997-01-14 Truswal Systems Corporation Truss with adjustable ends and metal web connectors
US5560177A (en) * 1996-03-04 1996-10-01 Brightwell; Lionel L. Trimmable open web joist
US6256958B1 (en) 1997-06-30 2001-07-10 Perf-X-Dek, L.L.C. Floor joist system
US5867963A (en) * 1997-09-23 1999-02-09 Truswal Systems Corporation Trimmable truss apparatus
US6651306B1 (en) 1999-07-23 2003-11-25 Mitek Holdings, Inc. Apparatus and method for fabricating flat trusses
US20010039779A1 (en) * 2000-05-10 2001-11-15 Romaro 2000 Limitee Structural wooden joist
US7509781B2 (en) 2000-10-05 2009-03-31 Romaro 2000 Limitee Structural wooden joist
US7093628B2 (en) 2000-10-06 2006-08-22 Mitek Holdings, Inc. Method of and apparatus for forming timbers with rounded ends
US20020148192A1 (en) * 2001-02-13 2002-10-17 Romaro 2000 Limitee Structural wooden joist
US6568134B2 (en) * 2001-07-20 2003-05-27 Thomas E. Kerney Componentized, three dimensional, self-aligning, self-engineering building system for homes, and modeling blocks therefor
US7513085B2 (en) 2003-10-24 2009-04-07 Nucon Steel Corporation Metal truss
US20050086893A1 (en) * 2003-10-24 2005-04-28 Moody Donald R. Metal truss
US7735294B2 (en) 2003-12-09 2010-06-15 Nucon Steel Corporation Roof truss
US20080295448A1 (en) * 2003-12-09 2008-12-04 Nucon Steel Corporation Roof truss
US20080295442A1 (en) * 2003-12-09 2008-12-04 Nucon Steel Corporation Roof truss
US8006461B2 (en) 2003-12-09 2011-08-30 Nucon Steel Corporation Roof truss
US20060123733A1 (en) * 2004-12-09 2006-06-15 Moody Donald R Roof truss
US7409804B2 (en) 2004-12-09 2008-08-12 Nucon Steel Corporation Roof truss
US20080134619A1 (en) * 2006-12-06 2008-06-12 Georgia-Pacific Wood Products Llc I-beam joist having openings formed therein for mechanical access
US20100263319A1 (en) * 2009-04-16 2010-10-21 Andre Lemyre Top-chord bearing wooden joist and method
US8122676B2 (en) * 2009-04-16 2012-02-28 Solive Ajouree 2000 Inc. Top-chord bearing wooden joist
US20120076977A1 (en) * 2010-09-27 2012-03-29 Weyerhaeuser Nr Company Reinforced wood product and reinforcement component
CN101949212A (en) * 2010-09-29 2011-01-19 中冶建筑研究总院有限公司;中国京冶工程技术有限公司 Slabform detachable support system and construction method thereof
CN101949212B (en) 2010-09-29 2012-04-25 中冶建筑研究总院有限公司 Slabform detachable support system and construction method thereof
US20120324827A1 (en) * 2011-06-25 2012-12-27 James Forero Bracing system for reinforcing beams
US20170016229A1 (en) * 2015-07-16 2017-01-19 Les Chantiers De Chibougamau Ltée I-joists and method of fabrication thereof
US9896844B2 (en) * 2015-07-16 2018-02-20 Les Chantiers De Chibougamau Ltée I-joists and method of fabrication thereof
US9663938B2 (en) * 2015-08-21 2017-05-30 Columbia Insurance Company Hanger for bracing panel

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